1. Hard pressed.
2. State of being or act of hard pressing.
3. An extreme pwning.

NOTE: An object is said to reach Clunch Completion when it becomes so clunchy that it cannot be clunched any more. An abbreviated term for this is Clunchkin.
NOTE 2: Clunching something quickly is called McClunching.

Even though I studied for a long time; that test completely clunched me.

Sometimes I feel that if another customer complains, I'll turn into a Clunchkin Case.